Pantograph



Nov. 24, 1925. 1,562,859

M. M. ANDERSON PANTOGRAPH Filed Dec. 20, 1923 2 SheetsSheet 1 r g K jww-nrm Nov. 24 1925- M. M. ANDERSON PANTOGRAPH 2 Sheets-Sheet 2 Filed Dec. 20, 1923 gnwwfw unites rnurocnateni.

Application filed December 520, 1928.

To all whom it um z conccm:

Be it known that I, AUR'IUE M. SON, a citizen of the United States, r. .5; inc at ll ladison. in the county oi Dane and State of lVisconsin. have invented. certain new ad usetul improvements in Pan graphs. oi which the following is a specification.

This invention relates to improvements in pantagraphs particularly adapted tor us in projecting maps, drawings. and the lilac.

An important object o1 the invention to provide a device which will. reproduce maps or the like to conform to the size and shape of the original.

A further object of the invention is to provide a device oil? this character which requires little effort to operate and is unlilrely to become out oil order.

A further object oi the invention is to provide a device of this character which. is comparatively simple yet durable oi. construction and etlicient ior the purpose. in-- tended.

Other objects and advantages o'l? this in vention will be apparent during the course oi the following description.

In the accompanying drawings 'lorming a part of this specification and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a top plan view of the device secured to a. drawing board.

Figure 2 is a side elevatirm ol the same.

Figure 3 is a transverse sectional View taken on the line of Figure 1.. and

Figure 4t is an end elevation of the device.

In the drawings, wherein tor the purpose oi illustration is shown the preterrml embodiment o'l? my invention, the numeral 10 designates a drawing board. the size and shape thereot depending on the outlineit is desired to reproduce. It. is considered desirable to provide transverse braces as shown at 11 to retain this board in firm condition and also to prevent warping ther of. Near one extremity of the drawing board 10 I provide a support arm 12, said support:- arm being positioned on the under side of the drawing board preferably adjacent the cross brace 11 which will strengthen the position thereof. In order to secure the support arm 12 to the drawing board in a rigid manner and without damaging the drawing board, a pair oil plates 13 having; suitable apertures therein are placed on the surface oi the board and a pair of thumb Elcrial No. 681,520.

screws l l are connected therethrmigh with the support arm and retain same securely in position.

Pivotally secured to the support arm 12 and forming a substantially rectangular frame are a pair of extension bars 15 and connecting bar 16, said connecting bar being. secured to the opposite extremities ot the extension bars 15 by means of thumb screws which act as pivots and permit angular movement 01 the bars 15 and 16 about the support arm 12.

The connecting bar 16 carries a cross arm 17 which is secured to said connecting bar midway of its extremities in a tired manner. One extremity of the cross arm 17 has a tracing arm 18 pivotally mounted thereon, said tracing arm carrying a tracer 19, in an aperture formed at the forward end thereof. The opposite end of the cross arm 17 has a. transmitting arm 20 pivotally mount-ed thereon, the forward extremity of said transmitting arm' having a pencil 2t or the like secured thereto. 'A brace 22 is pivotally connected with the central portion oi the tracing arm and transmitting arm and retains said arms in parallel planes at all times.

In use, the map or other matter it is desired to trace is secured on one extremity of the drawing board as illustrated at 23, while the paper or other material upon which an outline of the map or other matter is to be traced, is positioned at the opposite e7:- tremity oi the board. preferably centered about the pencil or other marking medium.

The operator is merely required to trace the contour oit his drawing with the stylus or pointer if) and the marking instrument 9. will reproduce a similar coutoi'u' upon the adjacent sheet. lt is obvious that the construction oi the device is unusually simple while possessing many advantages over similar devices now in use.

It is to be understood that the form oi my invention herewith shown and described is to be taken as the preferred example ot the same, and that various changes in the shape, size. and arrangement otparts may he resorted to without (:i-eparting from the spirit of the invention, or the scope oi. the subjoined claim.

Having thus described my invention. I claim:

A pantograph apparatus comprising a board a. brace disposed transversely across the board, securing devices carried by the board and spaced at equal distances from the brace and located between the edge of the brace and the end edge of the board, an arm connected with the securing devices and having an edge bearing against the adjacent edge of the brace, extension bars pivotally connected with the arm, a connecting bar pi-votally connected with the free ends of the first mentioned bars, a cross arm secured to the connecting bar at a point midway between the ends of the cross bar and at a point midway between the ends of the said arm, tracing arms pivotally con nected with said cross arm and a brace bar pivotally connected at its end with the tracing arm at points between the ends thereof.

In testimony whereof, I have atiixed my signature.

MAURICE M. ANDERSON. 

